Hasibuan, P. Y., Daulay , A. S., Ridwanto, R. and Pulungan , A. F. (2025) “Determination of Tannin Content in Mangkokan Leaves (Polyscias scutellaria (Burm.f.) Fosberg) and Guava Leaves (Psidium guajava L.) Using UV-Vis Spectrophotometry”, Journal of Pharmaceutical and Sciences, 8(4), pp. 3048–3057. doi: 10.36490/journal-jps.com.v8i4.972.